package com.greensock.easing
{

	public class Sine
	{
		private static const _HALF_PI:Number=Math.PI * 0.5;

		public static function easeIn(t:Number, b:Number, c:Number, d:Number):Number
		{
			return -c * Math.cos(t / d * _HALF_PI) + c + b;
		}

		public static function easeOut(t:Number, b:Number, c:Number, d:Number):Number
		{
			return c * Math.sin(t / d * _HALF_PI) + b;
		}

		public static function easeInOut(t:Number, b:Number, c:Number, d:Number):Number
		{
			return -c * 0.5 * (Math.cos(Math.PI * t / d) - 1) + b;
		}
	}
}


